i dont want to add fuel to the fire, but i wanted to voice my opinion on something.
first, everyone has different takes on cars, so take it easy: this is a hobby, not forum wars. but it is important to give different perspective to potential buyers since magazines reviews like RCCA isnt worth a crap when shopping for a car.
with that in mind, this is what i think about each car and their respective companies.
NTC3: i looked at the design and it seems they have some bugs to work out. I really dislike the location of the carb of the engine after its mounted on the chassis. and i dont like the fact that the left and right weight distributions change as the fuel is depleted. i've had an RC10GT before and i have to say i did break a fair amount of parts. a lot of people like AE's quality but i beg to differ.
705: i have not seen this car, but i have seen my friend's impulse before and it is fast... after the parts are broken in. many people complain about parts availability and price, so thats that. but also, the parts fit is far from perfect. my friend also bought a veteq that required a lot of handfitting, more than i'd ever car to do unless i was scratch building. very durable.
mtx3: again i have not seen it. but after seeing an MRX3 i can safely say any mugen car is a safe bet. the parts fit is damn near perfect and the finish is awesome.
V1RR: my personal car so i have the a lot to share on this one. i like the design and at the time it had more features than other cars (centax clutch being one of them). it is durable, but there are some stuff lacking in the current kit. the chassis could be nicer, where competing cars are now including machined chassis, this one has a stamped chassis. the fuel tank is a little high, and requires aftermarket chassis to "properly" remedy this. of course some of this is nit picking, and overall it is a great kit.
For now i'd go with kyosho or mugen. I cant say i've been impressed by AE or serpent overall but i was pleased with how mugen and kyosho products turned out. Buy the car that suits your personality, as a car should be reflective of yourself. If you like an NTC3 or a Serpent, by all means get one. Just remember to have some fun